JPH01311797A - Piezoelectric loudspeaker - Google Patents
Piezoelectric loudspeakerInfo
- Publication number
- JPH01311797A JPH01311797A JP14389688A JP14389688A JPH01311797A JP H01311797 A JPH01311797 A JP H01311797A JP 14389688 A JP14389688 A JP 14389688A JP 14389688 A JP14389688 A JP 14389688A JP H01311797 A JPH01311797 A JP H01311797A
- Authority
- JP
- Japan
- Prior art keywords
- diaphragm
- frame
- sound pressure
- pressure level
- piezoelectric
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000002093 peripheral effect Effects 0.000 description 7
- 239000011347 resin Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 230000007423 decrease Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000013013 elastic material Substances 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 239000005060 rubber Substances 0.000 description 2
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 229920006248 expandable polystyrene Polymers 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Landscapes
- Piezo-Electric Transducers For Audible Bands (AREA)
Abstract
Description
【発明の詳細な説明】
企業−ｈｏ利１じ辷艷
本発明は、圧電発音体にて振動板を振動さゼ発音する圧
電スピーカに関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piezoelectric speaker that generates sound by vibrating a diaphragm using a piezoelectric sounding body.
従来９伎■
本発明者は、この種の圧電スピーカとして、第３．４図
に示す構成のものを先に提案した。これは、圧電発音体
１４が取付けられた振動板１３を、その前面側周縁部に
貼着したエツジ板１２を介してフレーム１１に支持した
構成である。エツジ板１２としては発泡ウレタン、ゴム
、革等の弾性材料から成り、中央部を方形状にくり抜い
た方形状板体が用いられる。また、１５は、圧電発音体
１４を振動板１３の背面に支持するためのホルダーであ
り、振動板としての機能も有する。9. Conventional Art ■ The present inventor previously proposed a piezoelectric speaker of this type having the configuration shown in FIG. 3.4. This is a structure in which a diaphragm 13 to which a piezoelectric sounding body 14 is attached is supported by a frame 11 via an edge plate 12 attached to the front peripheral edge of the diaphragm 13. The edge plate 12 is made of an elastic material such as urethane foam, rubber, or leather, and is a rectangular plate with a square cutout in the center. Further, 15 is a holder for supporting the piezoelectric sounding body 14 on the back surface of the diaphragm 13, and also functions as a diaphragm.
溌」ル在」を決ユ、（＆−ζ道ｊト課月ところで、上記
した圧電スピーカにおいては振動板１３がエツジ板１２
を介してフレームの内方に支持さη、る構成であるため
、エツジ板１２の寸法ｅに対応して振動板１３の外径寸
法か小さくなり、音圧レヘルＰが低いものとなるという
問題がある。By the way, in the piezoelectric speaker described above, the diaphragm 13 is the edge plate 12.
Since the diaphragm 13 is supported inward of the frame through There is.
即ら、圧電スピーカの音圧レヘルＰは、下記の式で表さ
れるように振動板面積に線形比例するので、振動板の外
径寸法が小さいということは面積が小さく、従って音圧
レヘルが低いものになるのである。In other words, the sound pressure level P of a piezoelectric speaker is linearly proportional to the area of the diaphragm, as expressed by the equation below, so a small outer diameter of the diaphragm means a small area, and therefore the sound pressure level is It becomes lower.
Ｐ＝ｗ−ｕ・ｓ−ρ。・ｆ／ｒ
但し、Ｗ；角周波数
Ｕ；振動板の音の伝播速度
Ｓ；振動板の面積
ρ０ ；空気の密度
「；振動板の共振周波数
ｒ；振動板からの離隔距離
また、前記エツジ板１２に隙間があると空気が漏洩して
低域の音圧が低下するため、エツジ板１２としては一体
物を用いざるを得ない。しかるに、そのようなエツジ板
を用いると中央部の穴の存在により材料効率が悪く、コ
スト高となっていた。P=w-u・s-ρ.・f/r However, W; Angular frequency U; Sound propagation speed of the diaphragm S; Area of the diaphragm ρ0 ; Density of air; Resonance frequency of the diaphragm r; Separation distance from the diaphragm Also, the edge plate If there is a gap in the edge plate 12, air leaks and the sound pressure in the low range decreases, so an integral piece must be used as the edge plate 12. However, if such an edge plate is used, the hole in the center Due to its existence, material efficiency was poor and costs were high.
本発明は斯かる事情に鑑み“ζなされたものであり、音
圧レベルの向上か可能であり、また、材料効率がよい圧
電スピーカを提供することを目的とする。The present invention has been developed in view of the above circumstances, and an object of the present invention is to provide a piezoelectric speaker that can improve the sound pressure level and has good material efficiency.
課朋４潔夾ｔｊための１段
本発明に係る圧電スピーカは、圧電発音体が取付けられ
た振動板の背面縁部がフレームと対向し、この対向部分
に弾性支持片が介装されていることを特徴とする。In the piezoelectric speaker according to the present invention, the back edge of the diaphragm to which the piezoelectric sounding body is attached faces the frame, and an elastic support piece is interposed in this facing part. It is characterized by
１−一一舟
本発明にあっては、振動板の背面縁部が弾性支持片を介
してフレームに支持されるので、振動板をフレームと路
間−の大きさに迄大きくで森、このため振動板の面積Ｓ
が大きくなって音圧レベルが高くなる。また、振動板の
背面縁部に弾性支持片を設けるので、前側から見えず、
又空気の漏洩があっても音圧レベルの低下が起こりデ「
いため、弾性支持片に一体物を使用する必要がない。1-11 In the present invention, since the rear edge of the diaphragm is supported by the frame via the elastic support piece, the diaphragm can be enlarged to the size between the frame and the road. Therefore, the area of the diaphragm S
becomes louder and the sound pressure level increases. In addition, an elastic support piece is provided on the back edge of the diaphragm, so it is not visible from the front.
Also, even if there is air leakage, the sound pressure level will drop and the
Therefore, there is no need to use an integral piece for the elastic support piece.
実−為−１
第１図は本発明に係る圧電スピーカの一実施例を示す正
面図、第２図は第１図における■−■線による断面図で
ある。図中３は、振動が付与されると音を発する振動板
である。この振動板３は、発泡スチロール又は発泡ポリ
エチレン等からなる大小２枚の矩形状をした発泡樹脂板
４．５を貼着して一体化され、この周面側は段付き状と
なっている。ACTIVITY-1 FIG. 1 is a front view showing an embodiment of a piezoelectric speaker according to the present invention, and FIG. 2 is a cross-sectional view taken along the line ■-■ in FIG. 3 in the figure is a diaphragm that emits sound when vibration is applied. The diaphragm 3 is integrated by adhering two rectangular foam resin plates 4.5 made of foamed polystyrene, foamed polyethylene, or the like, and has a stepped shape on its peripheral surface.
発泡樹脂板４，５夫々の対向面中央部には円環状の溝４
ａ、５ａが位置を一敗させて設けられており、２つの講
４ａ、５ａにて形成された空間の内部には、前記？ａ４
ａ、５ａにて夫々間まれた各突起４ｂ、５ｂの先端によ
り圧電発音体６が挟まれた状態で支持されている。なお
、前記突起４ｂ。An annular groove 4 is provided in the center of the opposing surface of each of the foamed resin plates 4 and 5.
a and 5a are provided at different positions, and inside the space formed by the two sections 4a and 5a, there is the above-mentioned section 4a and 5a. a4
A piezoelectric sounding body 6 is supported in a sandwiched state by the tips of the protrusions 4b and 5b, which are spaced apart from each other at points a and 5a, respectively. Note that the protrusion 4b.
５ｂは、圧電発音体６を支持てきるように溝４ａ。5b is a groove 4a for supporting the piezoelectric sounding body 6;
５ａの深さ寸法よりも短くなしである。It is not shorter than the depth dimension of 5a.
上記圧電発音体６は、例えばＰＺＴ等からなる一対の円
形の圧電体６ａ、６ａを、これよりも大径である円形の
金属板６ｂの両面に貼着した構成であり、１丁重体６ａ
、６ａの外面に前記突起４ｂ。The piezoelectric sounding body 6 has a structure in which a pair of circular piezoelectric bodies 6a, 6a made of, for example, PZT are attached to both sides of a circular metal plate 6b having a larger diameter.
, 6a on the outer surface of said protrusion 4b.
５ｂの先端が接着等により取付けられていて、この圧電
発音体６により前記振動板３が駆動されて振動板３が前
面側より音を発するように、圧電発音体６には図示しな
いアンプから電気信号が与えられるようになっている。The tip of the piezoelectric sounding body 6 is attached by adhesive or the like, and the piezoelectric sounding body 6 receives electricity from an amplifier (not shown) so that the diaphragm 3 is driven by the piezoelectric sounding body 6 and the diaphragm 3 emits sound from the front side. A signal is now given.
振動板３は、面積の大きい側の発泡樹脂板４が前面側に
位置するように定める。背面側に位置する面積の小さい
側の発泡樹脂板５は、振動板としての機能とホルダーと
しての機能を有する。The diaphragm 3 is set so that the foamed resin plate 4 having a larger area is located on the front side. The foamed resin plate 5 located on the back side and having a smaller area has a function as a diaphragm and a holder.
振動板３の段付き状周縁部には、ごれを覆うフレーム１
が設けられている。このフレーム１は、全体が矩形の額
縁状をなし、内周面全長にわたって断面コの字状の溝１
ａを有しており、この前記溝Ｊａ内には振動板３の周縁
部が挿入され、°フレーム１は振動板３の周面及びこれ
に繋がる前面縁部３ａ、背面縁部３ｂを覆っている。こ
のフレーム１５よ、例えばアルミニウム等の金属板を用
いて矩形状に枠組みされていて、振動板３を挿入した後
に＋ｉｉ記前面縁部３ａ、背面縁部３ｂと対向する部分
が折り曲げ形成されている。従って、前面側には、フレ
ーム１と振動板３しか現れていす、美感に優れる。A frame 1 is provided on the stepped peripheral edge of the diaphragm 3 to cover dirt.
is provided. This frame 1 has a rectangular picture frame shape as a whole, and has a U-shaped groove 1 in cross section over the entire length of the inner peripheral surface.
The peripheral edge of the diaphragm 3 is inserted into the groove Ja, and the frame 1 covers the peripheral surface of the diaphragm 3 and the front edge 3a and back edge 3b connected thereto. There is. This frame 15 is framed in a rectangular shape using a metal plate such as aluminum, and after inserting the diaphragm 3, the portion facing the front edge 3a and rear edge 3b described in +ii is bent. . Therefore, only the frame 1 and the diaphragm 3 are visible on the front side, giving an excellent aesthetic appearance.
フレーム１の後側に位置する折り曲げ部ＩＣと、振動板
３の段付き状周縁部との間は、空洞となっていて、この
空洞内にはフレーム１の内側端部に沿って細長いテープ
状の弾性支持片２が隙間なく張り巡らされた状態に介装
され、この弾性支持片２により振動板３がフレーム１に
支持されている。A cavity is formed between the bent portion IC located on the rear side of the frame 1 and the stepped peripheral edge of the diaphragm 3. Elastic support pieces 2 are interposed in a tightly stretched state, and the diaphragm 3 is supported by the frame 1 by the elastic support pieces 2.
このように細長いテープ状の弾性支持片２を用いること
ができる理由は、弾性支持片２を振動板３の背面側に設
けるから前側から見えず、又これが背面側に位置するた
め、空気の漏洩があっても音圧レベルの低下が起こり難
いためである。なお、この弾性支持片２を用いる場合に
は、従来のシート状のものよりも位置合わせ等を容易に
でき、作業性の向上を図れる利点がある。The reason why the elongated tape-shaped elastic support piece 2 can be used is that since the elastic support piece 2 is provided on the back side of the diaphragm 3, it cannot be seen from the front side, and since it is located on the back side, it prevents air leakage. This is because even if there is a noise, the sound pressure level is unlikely to decrease. In addition, when using this elastic support piece 2, there is an advantage that alignment, etc. can be made easier than with a conventional sheet-like one, and workability can be improved.
ｉｉＩ記弾性支持片２は、発泡ウシタフ５発泡ポリエチ
レン等の発泡樹脂又は発泡ゴムを材料とした弾性を有す
るものであり、振動板３の振動かフレーム１にて抑制さ
れないようにしている。また、振動板３の周面および前
面縁部３ａとフレーム１の内面との間は、振動板３が振
動に支障のないように、隙間が生しるように寸法を定め
ておく。iii. The elastic support piece 2 is made of elastic material such as foamed resin or foamed rubber such as foamed Ushituff 5 foamed polyethylene, and prevents the vibration of the diaphragm 3 from being suppressed by the frame 1. Furthermore, the dimensions are determined so that a gap is created between the circumferential surface and front edge 3a of the diaphragm 3 and the inner surface of the frame 1 so that the diaphragm 3 does not interfere with vibration.
なお、上記実施例では２枚の大小の板を貼着して一体と
した振動板を使用しているが、本発明はこれに限らず、
１枚の板からなる振動板の背面側に圧電発音体を設けた
構成のものにも適用でき、また、板材の周縁部と中心部
とに突起を有する断面Ｅ字状のものをホルダー用に一対
用意し、突起形成側を内側としてこれらを対向させて中
心部の突起間に圧電発音体を挟圧支持した構造であって
、かつ振動板と対向する面積が圧電発音体と略等しい程
に小さく、つまり振動板として機能せずに圧電発音体を
支持するだけの機能しか有さないホルダーを、振動板の
背面に取付けた構成のものにも適用できる。In addition, in the above embodiment, a diaphragm is used that is made up of two large and small plates pasted together, but the present invention is not limited to this.
It can also be applied to a structure in which a piezoelectric sounding body is provided on the back side of a diaphragm made of a single plate, and a plate with an E-shaped cross section with protrusions on the periphery and center can be used as a holder. It has a structure in which a pair of piezoelectric sounding elements are prepared, and they are opposed with the protrusion forming side on the inside, and a piezoelectric sounding element is supported under pressure between the projections in the center, and the area facing the diaphragm is approximately equal to that of the piezoelectric sounding element. The present invention can also be applied to a structure in which a small holder, which does not function as a diaphragm but only has the function of supporting the piezoelectric sounding body, is attached to the back of the diaphragm.
また、上記実施例では断面コ字状のフレームを用いてい
るが、本発明はこれに限らず、背面側にのみ折り曲げ部
を有する、つまり断面がかぎ形状のフレームを用いて、
或いはこのフレームの折り曲げ部のみからなる、つまり
矩形平板状のフレームを用いて、これと振動板の背面縁
部との間に弾性支持片を設けるようにしてもよい。Further, in the above embodiment, a frame having a U-shaped cross section is used, but the present invention is not limited to this, and the present invention is not limited to this.
Alternatively, a rectangular flat frame consisting only of bent portions of the frame may be used, and an elastic support piece may be provided between this frame and the rear edge of the diaphragm.
光−胛Ω−効−采
以上詳述した如く本発明による場合には、振動板の背面
縁部とフレームとが対向する構成であるので、振動板を
フレームと路間−の大きさるこ迄大きくでき、このため
振動板の面積が大きくなることにより音圧レベルの向上
を図れ、また、振動板の背面縁部に弾性支持片を設ける
ので、前側から見えず、又空気の漏洩があっても音圧レ
ベルの低下が起こり難いため、弾性支持片に一体物を使
用する必要がなく、このために材料効率の向上をも図れ
る等、優れた効果を奏する。As described in detail above, in the case of the present invention, the rear edge of the diaphragm and the frame face each other, so the diaphragm can be moved up to the size of the space between the frame and the road. The sound pressure level can be improved by increasing the area of the diaphragm, and since an elastic support piece is provided on the back edge of the diaphragm, it is not visible from the front and there is no air leakage. Since the sound pressure level is less likely to decrease, there is no need to use an integral piece for the elastic support piece, and this provides excellent effects such as improved material efficiency.
第１図は本発明に係る圧電スピーカの一実施例を示す正
面図、第２図は第１図の■−■線による断面図、第３図
は先に提案した圧電スピーカを示す正面図、第４図は第
３図のＩＶ −ＩＶ線による断面図である。
１・・・フレーム、２・・・弾性支持片、３・・・振動
板、６・・・圧電発音体。
特許出願人 株式会社村田製作所
第２図 第１図
ユ」
第４図
第３図
１Ｖ″’１ １１
／
■」FIG. 1 is a front view showing an embodiment of a piezoelectric speaker according to the present invention, FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1, and FIG. 3 is a front view showing the piezoelectric speaker proposed earlier. FIG. 4 is a sectional view taken along line IV--IV in FIG. 3. DESCRIPTION OF SYMBOLS 1... Frame, 2... Elastic support piece, 3... Vibration plate, 6... Piezoelectric sounding body. Patent applicant Murata Manufacturing Co., Ltd. Figure 2 Figure 1 Figure 4 Figure 3 1V'''1 11/■''
Claims (1)
レームと対向し、この対向部分に弾性支持片が介装され
ていることを特徴とする圧電スピーカ。(1) A piezoelectric speaker characterized in that a rear edge of a diaphragm to which a piezoelectric sounding body is attached faces a frame, and an elastic support piece is interposed in this facing portion.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63143896A JP2580551B2 (en) | 1988-06-10 | 1988-06-10 | Piezo speaker |
| US07/312,999 US4969197A (en) | 1988-06-10 | 1989-02-21 | Piezoelectric speaker |
| GB8904637A GB2219712B (en) | 1988-06-10 | 1989-03-01 | Piezoelectric speaker |
| DE3907540A DE3907540A1 (en) | 1988-06-10 | 1989-03-08 | PIEZOELECTRIC SPEAKER |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63143896A JP2580551B2 (en) | 1988-06-10 | 1988-06-10 | Piezo speaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01311797A true JPH01311797A (en) | 1989-12-15 |
| JP2580551B2 JP2580551B2 (en) | 1997-02-12 |
Family
ID=15349573
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63143896A Expired - Lifetime JP2580551B2 (en) | 1988-06-10 | 1988-06-10 | Piezo speaker |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2580551B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0423396U (en) * | 1990-06-18 | 1992-02-26 | ||
| JP2012015765A (en) * | 2010-06-30 | 2012-01-19 | Nec Corp | Oscillator |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS587999A (en) * | 1981-07-06 | 1983-01-17 | Murata Mfg Co Ltd | Piezoelectric speaker |
| JPS6381497U (en) * | 1986-11-12 | 1988-05-28 |
-
1988
- 1988-06-10 JP JP63143896A patent/JP2580551B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS587999A (en) * | 1981-07-06 | 1983-01-17 | Murata Mfg Co Ltd | Piezoelectric speaker |
| JPS6381497U (en) * | 1986-11-12 | 1988-05-28 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0423396U (en) * | 1990-06-18 | 1992-02-26 | ||
| JP2012015765A (en) * | 2010-06-30 | 2012-01-19 | Nec Corp | Oscillator |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2580551B2 (en) | 1997-02-12 |
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